About:

Docker image based on openjdk:8-jre-alpine

Additional Software:

• Apache ZooKeeper

Usage:

General Configuration:

ZooKeeper can be configured via environment variables:

Environment Variable	Zookeeper Property	Default
ZOOKEEPER_ID	N/A	1
ZOOKEEPER_TICK_TIME	tickTime	2000
ZOOKEEPER_INIT_LIMIT	initLimit	10
ZOOKEEPER_SYNC_LIMIT	syncLimit	5
ZOOKEEPER_CLIENT_CNXNS	maxClientCnxns	60
ZOOKEEPER_AUTOPURGE_SNAP_RETAIN_COUNT	autopurge.snapRetainCount	3
ZOOKEEPER_AUTOPURGE_PURGE_INTERVAL	autopurge.purgeInterval	0

Standalone Mode:

If you are happy with the defaults, simply run the container:

$ docker run -d -p 2181:2181 -p 2888:2888 -p 3888:3888 digitalwonderland/zookeeper

Clustered Mode:

To run a cluster, just add more ZOOKEEPER_SERVER_X environment variables (replace X with the respective id) set to the respective ip address.

For example to run a cluster on 172.17.8.101, 172.17.8.102 and 172.17.8.103, run the following on the respective hosts:

On 172.17.8.101:

$ docker run -d -p 2181:2181 -p 2888:2888 -p 3888:3888 -e ZOOKEEPER_ID=1 -e ZOOKEEPER_SERVER_1=172.17.8.101 -e ZOOKEEPER_SERVER_2=172.17.8.102 -e ZOOKEEPER_SERVER_3=172.17.8.103 digitalwonderland/zookeeper

On 172.17.8.102:

$ docker run -d -p 2181:2181 -p 2888:2888 -p 3888:3888 -e ZOOKEEPER_ID=2 -e ZOOKEEPER_SERVER_1=172.17.8.101 -e ZOOKEEPER_SERVER_2=172.17.8.102 -e ZOOKEEPER_SERVER_3=172.17.8.103 digitalwonderland/zookeeper

On 172.17.8.103:

$ docker run -d -p 2181:2181 -p 2888:2888 -p 3888:3888 -e ZOOKEEPER_ID=3 -e ZOOKEEPER_SERVER_1=172.17.8.101 -e ZOOKEEPER_SERVER_2=172.17.8.102 -e ZOOKEEPER_SERVER_3=172.17.8.103 digitalwonderland/zookeeper

Note: A more dynamic configuration is not possible with Zookeeper v3.4 which will change with v3.5.